Youcef Nadarkhani's sentence has been affirmed at the highest levels of Iran's legal system and could be carried out at anytime, according to his supporters. The sentence shows that Tehran has again "failed to uphold its obligations to the Universal Declaration of Human Rights and the International Covenant on Civil and Political Rights," reads House Resolution 556.

The resolution, drafted by Pennsylvania Republican Joseph Pitts, calls for Iran to immediately exonerate and unconditionally release Nadarkhani as well as any other people who are being held or charged for religious or political beliefs.

"In Iran today, Pastor Youcef Nadharkani is in a high security prison wondering whether he will be executed for his faith," Pitts told FoxNews.com. "The government of Iran should abide by the agreements they have signed at the United Nations, which call for religious freedom. The House is asking the highest authorities in Iran to let Pastor Youcef return to his family and worship in peace."

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Nadarkhani, who also held house church services in Iran, was facing execution after being convicted of apostasy in November 2010, but appealed his conviction all the way up to the Iranian Supreme Court. He refused to renounce his Christianity and was sentenced to death.

Amid widespread condemnation, the Iranian court introduced new charges of rape and extortion, charges Nadarkhani's supporters say are false and trumped up merely to justify his execution.